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class="posts-expand"><article class="post post-type-normal" itemscope itemtype="http://schema.org/Article"><link itemprop="mainEntityOfPage" href="http://mrbird.cc/Thymeleaf-表达式工具类.html"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="name" content="MrBird"><meta itemprop="description" content=""><meta itemprop="image" content="/images/blogImage.jpg"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="MrBird"></span><header class="post-header"><h1 class="post-title" itemprop="name headline">Thymeleaf 表达式工具类</h1><div class="post-meta"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-calendar-o"></i> </span><span class="post-meta-item-text">Posted on</span> <time title="创建于" itemprop="dateCreated datePublished" datetime="2017-09-10T10:36:30+08:00">2017-09-10 </time></span><span></span> <span class="post-meta-divider">|</span> <span class="page-pv"><i class="fa fa-laptop"></i>&nbsp;&nbsp;Visit count <span class="busuanzi-value" id="busuanzi_value_page_pv"></span></span></div></header><div class="post-body" itemprop="articleBody"><p>Thymeleaf默认提供了丰富的表达式工具类，这里列举一些常用的工具类。</p><h2 id="Objects工具类"><a href="#Objects工具类" class="headerlink" title="Objects工具类"></a>Objects工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 当obj不为空时，返回obj，否则返回default默认值</span><br><span class="line"> * 其同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#objects.nullSafe(obj,default)&#125;</span><br><span class="line">$&#123;#objects.arrayNullSafe(objArray,default)&#125;</span><br><span class="line">$&#123;#objects.listNullSafe(objList,default)&#125;</span><br><span class="line">$&#123;#objects.setNullSafe(objSet,default)&#125;</span><br></pre></td></tr></table></figure><a id="more"></a><h2 id="String工具类"><a href="#String工具类" class="headerlink" title="String工具类"></a>String工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * Null-safe toString()</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.toString(obj)&#125;   // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查String是否为空(或null)。在检查之前执行trim()操作也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.isEmpty(name)&#125;</span><br><span class="line">$&#123;#strings.arrayIsEmpty(nameArr)&#125;</span><br><span class="line">$&#123;#strings.listIsEmpty(nameList)&#125;</span><br><span class="line">$&#123;#strings.setIsEmpty(nameSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 对字符串执行“isEmpty()”检查, 如果为false则返回它, 如果为true则默认为另一个指定的字符串。</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.defaultString(text,default)&#125;</span><br><span class="line">$&#123;#strings.arrayDefaultString(textArr,default)&#125;</span><br><span class="line">$&#123;#strings.listDefaultString(textList,default)&#125;</span><br><span class="line">$&#123;#strings.setDefaultString(textSet,default)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查字符串中是否包含片段，比如 $&#123;#strings.containsIgnoreCase(user.name,'kang')&#125;</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.contains(name,'ez')&#125;               // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.containsIgnoreCase(name,'ez')&#125;     // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查字符串是否以片段开始或结束</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.startsWith(name,'Don')&#125;            // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.endsWith(name,endingFragment)&#125;     // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 子串相关操作</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.indexOf(name,frag)&#125;                // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.substring(name,3,5)&#125;               // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.substringAfter(name,prefix)&#125;       // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.substringBefore(name,suffix)&#125;      // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.replace(name,'las','ler')&#125;         // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 附加和前置</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.prepend(str,prefix)&#125;               // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.append(str,suffix)&#125;                // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 大小写转换</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.toUpperCase(name)&#125;                 // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.toLowerCase(name)&#125;                 // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 拆分和拼接</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.arrayJoin(namesArray,',')&#125;</span><br><span class="line">$&#123;#strings.listJoin(namesList,',')&#125;</span><br><span class="line">$&#123;#strings.setJoin(namesSet,',')&#125;</span><br><span class="line">$&#123;#strings.arraySplit(namesStr,',')&#125;          // 返回String []</span><br><span class="line">$&#123;#strings.listSplit(namesStr,',')&#125;           // 返回List<span class="tag">&lt;<span class="name">String</span>&gt;</span></span><br><span class="line">$&#123;#strings.setSplit(namesStr,',')&#125;            // 返回Set<span class="tag">&lt;<span class="name">String</span>&gt;</span></span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * Trim</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.trim(str)&#125;                         // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 计算长度</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.length(str)&#125;                       // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 缩写文本, 使其最大大小为n。如果文本较大, 它将被剪辑并在末尾附加“...”</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.abbreviate(str,10)&#125;                // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 将第一个字符转换为大写(反之亦然)</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.capitalize(str)&#125;                   // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.unCapitalize(str)&#125;                 // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 将每个单词的第一个字符转换为大写</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.capitalizeWords(str)&#125;              // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.capitalizeWords(str,delimiters)&#125;   // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 转义字符串</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.escapeXml(str)&#125;                    // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.escapeJava(str)&#125;                   // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.escapeJavaScript(str)&#125;             // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">$&#123;#strings.unescapeJava(str)&#125;                 // 也可以是 array*、list* 或 set*</span><br><span class="line">$&#123;#strings.unescapeJavaScript(str)&#125;           // 也可以是 array*、list* 或 set*</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 空安全比较和连接</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.equals(first, second)&#125;</span><br><span class="line">$&#123;#strings.equalsIgnoreCase(first, second)&#125;</span><br><span class="line">$&#123;#strings.concat(values...)&#125;</span><br><span class="line">$&#123;#strings.concatReplaceNulls(nullValue, values...)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 随机数</span><br><span class="line"> */</span><br><span class="line">$&#123;#strings.randomAlphanumeric(count)&#125;</span><br></pre></td></tr></table></figure><h2 id="Dates工具类"><a href="#Dates工具类" class="headerlink" title="Dates工具类"></a>Dates工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 使用标准区域设置格式格式化日期</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.format(date)&#125;</span><br><span class="line">$&#123;#dates.arrayFormat(datesArray)&#125;</span><br><span class="line">$&#123;#dates.listFormat(datesList)&#125;</span><br><span class="line">$&#123;#dates.setFormat(datesSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 使用ISO8601格式格式化日期</span><br><span class="line">  * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.formatISO(date)&#125;</span><br><span class="line">$&#123;#dates.arrayFormatISO(datesArray)&#125;</span><br><span class="line">$&#123;#dates.listFormatISO(datesList)&#125;</span><br><span class="line">$&#123;#dates.setFormatISO(datesSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 使用指定的格式格式化日期，比如 $&#123;#dates.format(date,'yyyy-MM-dd HH:mm:ss')&#125;</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.format(date, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line">$&#123;#dates.arrayFormat(datesArray, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line">$&#123;#dates.listFormat(datesList, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line">$&#123;#dates.setFormat(datesSet, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 获取日期属性</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.day(date)&#125;                    // 也可以是 arrayDay(...), listDay(...)之类的</span><br><span class="line">$&#123;#dates.month(date)&#125;                  // 也可以是 arrayMonth(...), listMonth(...)之类的</span><br><span class="line">$&#123;#dates.monthName(date)&#125;              // 也可以是 arrayMonthName(...), listMonthName(...)之类的</span><br><span class="line">$&#123;#dates.monthNameShort(date)&#125;         // 也可以是 arrayMonthNameShort(...), listMonthNameShort(...)之类的</span><br><span class="line">$&#123;#dates.year(date)&#125;                   // 也可以是 arrayYear(...), listYear(...)之类的</span><br><span class="line">$&#123;#dates.dayOfWeek(date)&#125;              // 也可以是 arrayDayOfWeek(...), listDayOfWeek(...)之类的</span><br><span class="line">$&#123;#dates.dayOfWeekName(date)&#125;          // 也可以是 arrayDayOfWeekName(...), listDayOfWeekName(...)之类的</span><br><span class="line">$&#123;#dates.dayOfWeekNameShort(date)&#125;     // 也可以是 arrayDayOfWeekNameShort(...), listDayOfWeekNameShort(...)之类的</span><br><span class="line">$&#123;#dates.hour(date)&#125;                   // 也可以是 arrayHour(...), listHour(...)之类的</span><br><span class="line">$&#123;#dates.minute(date)&#125;                 // 也可以是 arrayMinute(...), listMinute(...)之类的</span><br><span class="line">$&#123;#dates.second(date)&#125;                 // 也可以是 arraySecond(...), listSecond(...)之类的</span><br><span class="line">$&#123;#dates.millisecond(date)&#125;            // 也可以是 arrayMillisecond(...), listMillisecond(...)之类的</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 根据year,month,day创建日期(java.util.Date)对象，比如 $&#123;#dates.create('2008','08','08')&#125;</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.create(year,month,day)&#125;</span><br><span class="line">$&#123;#dates.create(year,month,day,hour,minute)&#125;</span><br><span class="line">$&#123;#dates.create(year,month,day,hour,minute,second)&#125;</span><br><span class="line">$&#123;#dates.create(year,month,day,hour,minute,second,millisecond)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 创建当前日期和时间创建日期(java.util.Date)对象，比如 $&#123;#dates.format(#dates.createNow(),'yyyy-MM-dd HH:mm:ss')&#125;</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.createNow()&#125;</span><br><span class="line"></span><br><span class="line">$&#123;#dates.createNowForTimeZone()&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 创建当前日期创建一个日期(java.util.Date)对象(时间设置为00:00)</span><br><span class="line"> */</span><br><span class="line">$&#123;#dates.createToday()&#125;</span><br><span class="line"></span><br><span class="line">$&#123;#dates.createTodayForTimeZone()&#125;</span><br></pre></td></tr></table></figure><h2 id="Calendars工具类"><a href="#Calendars工具类" class="headerlink" title="Calendars工具类"></a>Calendars工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 使用标准区域设置格式格式化日历</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.format(cal)&#125;</span><br><span class="line">$&#123;#calendars.arrayFormat(calArray)&#125;</span><br><span class="line">$&#123;#calendars.listFormat(calList)&#125;</span><br><span class="line">$&#123;#calendars.setFormat(calSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 使用ISO8601格式格式化日历</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.formatISO(cal)&#125;</span><br><span class="line">$&#123;#calendars.arrayFormatISO(calArray)&#125;</span><br><span class="line">$&#123;#calendars.listFormatISO(calList)&#125;</span><br><span class="line">$&#123;#calendars.setFormatISO(calSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 使用指定的格式格式化日历</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.format(cal, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line">$&#123;#calendars.arrayFormat(calArray, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line">$&#123;#calendars.listFormat(calList, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line">$&#123;#calendars.setFormat(calSet, 'dd/MMM/yyyy HH:mm')&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 获取日历属性</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.day(date)&#125;                // 也可以是 arrayDay(...), listDay(...)之类的</span><br><span class="line">$&#123;#calendars.month(date)&#125;              // 也可以是 arrayMonth(...), listMonth(...)之类的</span><br><span class="line">$&#123;#calendars.monthName(date)&#125;          // 也可以是 arrayMonthName(...), listMonthName(...)之类的</span><br><span class="line">$&#123;#calendars.monthNameShort(date)&#125;     // 也可以是 arrayMonthNameShort(...), listMonthNameShort(...)之类的</span><br><span class="line">$&#123;#calendars.year(date)&#125;               // 也可以是 arrayYear(...), listYear(...)之类的</span><br><span class="line">$&#123;#calendars.dayOfWeek(date)&#125;          // 也可以是 arrayDayOfWeek(...), listDayOfWeek(...)之类的</span><br><span class="line">$&#123;#calendars.dayOfWeekName(date)&#125;      // 也可以是 arrayDayOfWeekName(...), listDayOfWeekName(...)之类的</span><br><span class="line">$&#123;#calendars.dayOfWeekNameShort(date)&#125; // 也可以是 arrayDayOfWeekNameShort(...), listDayOfWeekNameShort(...)之类的</span><br><span class="line">$&#123;#calendars.hour(date)&#125;               // 也可以是 arrayHour(...), listHour(...)之类的</span><br><span class="line">$&#123;#calendars.minute(date)&#125;             // 也可以是 arrayMinute(...), listMinute(...)之类的</span><br><span class="line">$&#123;#calendars.second(date)&#125;             // 也可以是 arraySecond(...), listSecond(...)之类的</span><br><span class="line">$&#123;#calendars.millisecond(date)&#125;        // 也可以是 arrayMillisecond(...), listMillisecond(...)之类的</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 从其组件创建日历(java.util.Calendar)对象</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.create(year,month,day)&#125;</span><br><span class="line">$&#123;#calendars.create(year,month,day,hour,minute)&#125;</span><br><span class="line">$&#123;#calendars.create(year,month,day,hour,minute,second)&#125;</span><br><span class="line">$&#123;#calendars.create(year,month,day,hour,minute,second,millisecond)&#125;</span><br><span class="line"></span><br><span class="line">$&#123;#calendars.createForTimeZone(year,month,day,timeZone)&#125;</span><br><span class="line">$&#123;#calendars.createForTimeZone(year,month,day,hour,minute,timeZone)&#125;</span><br><span class="line">$&#123;#calendars.createForTimeZone(year,month,day,hour,minute,second,timeZone)&#125;</span><br><span class="line">$&#123;#calendars.createForTimeZone(year,month,day,hour,minute,second,millisecond,timeZone)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 为当前日期和时间创建一个日历(java.util.Calendar)对象</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.createNow()&#125;</span><br><span class="line"></span><br><span class="line">$&#123;#calendars.createNowForTimeZone()&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 为当前日期创建日历(java.util.Calendar)对象(时间设置为00:00)</span><br><span class="line"> */</span><br><span class="line">$&#123;#calendars.createToday()&#125;</span><br><span class="line"></span><br><span class="line">$&#123;#calendars.createTodayForTimeZone()&#125;</span><br></pre></td></tr></table></figure><h2 id="Numbers工具类"><a href="#Numbers工具类" class="headerlink" title="Numbers工具类"></a>Numbers工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * ==========================</span><br><span class="line"> * 格式化整数</span><br><span class="line"> * ==========================</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">/* </span><br><span class="line"> * 设置最小整数位数。</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#numbers.formatInteger(num,3)&#125;</span><br><span class="line">$&#123;#numbers.arrayFormatInteger(numArray,3)&#125;</span><br><span class="line">$&#123;#numbers.listFormatInteger(numList,3)&#125;</span><br><span class="line">$&#123;#numbers.setFormatInteger(numSet,3)&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">/* </span><br><span class="line"> * 设置最小整数位数和千位分隔符：</span><br><span class="line"> * 'POINT'、'COMMA'、'WHITESPACE'、'NONE' 或 'DEFAULT'(根据本地化)。</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#numbers.formatInteger(num,3,'POINT')&#125;</span><br><span class="line">$&#123;#numbers.arrayFormatInteger(numArray,3,'POINT')&#125;</span><br><span class="line">$&#123;#numbers.listFormatInteger(numList,3,'POINT')&#125;</span><br><span class="line">$&#123;#numbers.setFormatInteger(numSet,3,'POINT')&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * ==========================</span><br><span class="line"> * 格式化十进制数</span><br><span class="line"> * ==========================</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 设置最小整数数字和(精确的)十进制数字。</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#numbers.formatDecimal(num,3,2)&#125;</span><br><span class="line">$&#123;#numbers.arrayFormatDecimal(numArray,3,2)&#125;</span><br><span class="line">$&#123;#numbers.listFormatDecimal(numList,3,2)&#125;</span><br><span class="line">$&#123;#numbers.setFormatDecimal(numSet,3,2)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 设置最小整数数字和(精确的)小数位数, 以及小数分隔符。</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#numbers.formatDecimal(num,3,2,'COMMA')&#125;</span><br><span class="line">$&#123;#numbers.arrayFormatDecimal(numArray,3,2,'COMMA')&#125;</span><br><span class="line">$&#123;#numbers.listFormatDecimal(numList,3,2,'COMMA')&#125;</span><br><span class="line">$&#123;#numbers.setFormatDecimal(numSet,3,2,'COMMA')&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 设置最小整数数字和(精确的)十进制数字, 以及千位和十进制分隔符。</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#numbers.formatDecimal(num,3,'POINT',2,'COMMA')&#125;</span><br><span class="line">$&#123;#numbers.arrayFormatDecimal(numArray,3,'POINT',2,'COMMA')&#125;</span><br><span class="line">$&#123;#numbers.listFormatDecimal(numList,3,'POINT',2,'COMMA')&#125;</span><br><span class="line">$&#123;#numbers.setFormatDecimal(numSet,3,'POINT',2,'COMMA')&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * ==========================</span><br><span class="line"> * 实用方法</span><br><span class="line"> * ==========================</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 创建一个从x到y的整数序列(数组)</span><br><span class="line"> */</span><br><span class="line">$&#123;#numbers.sequence(from,to)&#125;</span><br><span class="line">$&#123;#numbers.sequence(from,to,step)&#125;</span><br></pre></td></tr></table></figure><p>比如：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(0.1024,3)&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1.024,3)&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(10.24,3)&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(102.4,3)&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br></pre></td></tr></table></figure><p></p><p>页面输出：</p><p><img src="img/mrbird_photo_20170927145905.png" alt="mrbird_photo_20170927145905.png"></p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1.024,2,'POINT')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1024,3,'POINT')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1024,10,'POINT')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1.024,2,'COMMA')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1024,3,'COMMA')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1024,10,'COMMA')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1.024,2,'WHITESPACE')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1024,3,'WHITESPACE')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">p</span> <span class="attr">th:utext</span>=<span class="string">"$&#123;#numbers.formatInteger(1024,10,'WHITESPACE')&#125;"</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br></pre></td></tr></table></figure><p>页面输出：</p><p><img src="img/mrbird_photo_20170927150746.png" alt="mrbird_photo_20170927150746.png"></p><p>POINT指的是<code>.</code>，COMMA指的是<code>,</code>，WHITESPACE指的是空格。三个数位为一组，使用指定的分隔符分割。比如1.024并不是小数，而是使用了<code>.</code>分隔的1024。</p><h2 id="Booleans工具类"><a href="#Booleans工具类" class="headerlink" title="Booleans工具类"></a>Booleans工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 评估条件, 类似于 th:if 标签</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#bools.isTrue(obj)&#125;</span><br><span class="line">$&#123;#bools.arrayIsTrue(objArray)&#125;</span><br><span class="line">$&#123;#bools.listIsTrue(objList)&#125;</span><br><span class="line">$&#123;#bools.setIsTrue(objSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 用否定来评估条件</span><br><span class="line"> * 也同样适用于数组、列表或集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#bools.isFalse(cond)&#125;</span><br><span class="line">$&#123;#bools.arrayIsFalse(condArray)&#125;</span><br><span class="line">$&#123;#bools.listIsFalse(condList)&#125;</span><br><span class="line">$&#123;#bools.setIsFalse(condSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 评估条件并执行与操作</span><br><span class="line"> * 接收数组、列表或集合作为参数</span><br><span class="line"> */</span><br><span class="line">$&#123;#bools.arrayAnd(condArray)&#125;</span><br><span class="line">$&#123;#bools.listAnd(condList)&#125;</span><br><span class="line">$&#123;#bools.setAnd(condSet)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 评估条件并执行或操作</span><br><span class="line"> * 接收数组、列表或集合作为参数</span><br><span class="line"> */</span><br><span class="line">$&#123;#bools.arrayOr(condArray)&#125;</span><br><span class="line">$&#123;#bools.listOr(condList)&#125;</span><br><span class="line">$&#123;#bools.setOr(condSet)&#125;</span><br></pre></td></tr></table></figure><h2 id="Arrays工具类"><a href="#Arrays工具类" class="headerlink" title="Arrays工具类"></a>Arrays工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 转换为数组, 试图推断数组组件类。注意, 如果结果数组为空, 或者目标对象的元素不是全部相同的类, 则</span><br><span class="line"> * 此方法将返回Object []。</span><br><span class="line"> */</span><br><span class="line">$&#123;#arrays.toArray(object)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 转换为指定组件类的数组。</span><br><span class="line"> */</span><br><span class="line">$&#123;#arrays.toStringArray(object)&#125;</span><br><span class="line">$&#123;#arrays.toIntegerArray(object)&#125;</span><br><span class="line">$&#123;#arrays.toLongArray(object)&#125;</span><br><span class="line">$&#123;#arrays.toDoubleArray(object)&#125;</span><br><span class="line">$&#123;#arrays.toFloatArray(object)&#125;</span><br><span class="line">$&#123;#arrays.toBooleanArray(object)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line">* 计算数组长度</span><br><span class="line"> */</span><br><span class="line">$&#123;#arrays.length(array)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查数组是否为空</span><br><span class="line"> */</span><br><span class="line">$&#123;#arrays.isEmpty(array)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查数组中是否包含元素或元素集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#arrays.contains(array, element)&#125;</span><br><span class="line">$&#123;#arrays.containsAll(array, elements)&#125;</span><br></pre></td></tr></table></figure><h2 id="Lists工具类"><a href="#Lists工具类" class="headerlink" title="Lists工具类"></a>Lists工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 转化为 list</span><br><span class="line"> */</span><br><span class="line">$&#123;#lists.toList(object)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 计算大小</span><br><span class="line"> */</span><br><span class="line">$&#123;#lists.size(list)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> */</span><br><span class="line">$&#123;#lists.isEmpty(list)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查list中是否包含元素或元素集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#lists.contains(list, element)&#125;</span><br><span class="line">$&#123;#lists.containsAll(list, elements)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 排序给定列表的副本。列表的成员必须</span><br><span class="line"> * 实现comparable, 或者必须定义comparator。</span><br><span class="line"> */</span><br><span class="line">$&#123;#lists.sort(list)&#125;</span><br><span class="line">$&#123;#lists.sort(list, comparator)&#125;</span><br></pre></td></tr></table></figure><h2 id="Sets工具类"><a href="#Sets工具类" class="headerlink" title="Sets工具类"></a>Sets工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 转化为 to set</span><br><span class="line"> */</span><br><span class="line">$&#123;#sets.toSet(object)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 计算大小</span><br><span class="line"> */</span><br><span class="line">$&#123;#sets.size(set)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查set是否为empty</span><br><span class="line"> */</span><br><span class="line">$&#123;#sets.isEmpty(set)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查set中是否包含元素或元素集合</span><br><span class="line"> */</span><br><span class="line">$&#123;#sets.contains(set, element)&#125;</span><br><span class="line">$&#123;#sets.containsAll(set, elements)&#125;</span><br></pre></td></tr></table></figure><h2 id="Maps工具类"><a href="#Maps工具类" class="headerlink" title="Maps工具类"></a>Maps工具类</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * 计算大小</span><br><span class="line"> */</span><br><span class="line">$&#123;#maps.size(map)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查map是否为空</span><br><span class="line"> */</span><br><span class="line">$&#123;#maps.isEmpty(map)&#125;</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line"> * 检查map中是否包含key/s或value/s</span><br><span class="line"> */</span><br><span class="line">$&#123;#maps.containsKey(map, key)&#125;</span><br><span class="line">$&#123;#maps.containsAllKeys(map, keys)&#125;</span><br><span class="line">$&#123;#maps.containsValue(map, value)&#125;</span><br><span class="line">$&#123;#maps.containsAllValues(map, value)&#125;</span><br></pre></td></tr></table></figure><h2 id="注意事项"><a href="#注意事项" class="headerlink" title="注意事项"></a>注意事项</h2><p>值得注意的是，在使用工具类对某个表达式进行处理时候，你可能会写成：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$&#123;#strings.isEmpty($&#123;session.user.name&#125;)&#125;。</span><br></pre></td></tr></table></figure><p></p><p>实际上这种写法是错误的，将抛出异常。正确的写法为：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$&#123;#strings.isEmpty(session.user.name)&#125;。</span><br></pre></td></tr></table></figure><p></p><script>$(".post-body a").not(".thispage").addClass("ignore-href").attr("target","_blank")</script></div><div></div><div><div 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